Melanie Gifford, research conservator, National Gallery of Art, Washington, DC, discusses what new information obtained from chemical imaging tells us about the working methods of Rembrandt in some of his later works, such as Apostle Paul at the Gallery and Saul and David at the Mauritshuis. Gifford spoke at a one-day symposium held at the National Gallery of Art on September 21, 2015, which was supported by The Andrew W. Mellon Foundation.